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Description
Demonstration circuit 1687A features the LTC
high voltage monolithic synchronous buck-boost converter.
The DC1687A demo board has two user selectable operat-
ing modes: Burst Mode
operation (fixed frequency PWM) (JP1). There is also an
accurate programmable RUN pin which is used to enable
the converter (JP2).
The DC1687A operates with a 2.7V to 40V input volt-
age range. The demo board has been designed with the
output voltage set to 5.0V. The LTC3115-1 incorporates a
proprietary low noise switching algorithm which optimizes
efficiency with input voltages above, below or equal to the
output voltage and ensures seamless transitions between
operating modes.
The demo board has been programmed to operate at 1MHz
in PWM mode to optimize small size with high efficiency
operation.
performance summary
PARAMETER
Input Voltage Range
V
OUT
I
(See Note 1)
OUT
Efficiency
Note 1: The Demo Board output current is a function of V
Arrow.com.
Downloaded from
3115-1, a
®
operation and forced continuous
®
. Please refer to the data sheet for more information
IN
DEMO MANUAL DC1687A
40V, 2A Synchronous
Buck-Boost DC/DC Converter
The demo board also has optional provisions to back
feed V
in order to increase efficiency in some 5V out-
CC
put applications. There is also a provision for an optional
Schottky diode from SW2 to V
V
is greater than 20V and short circuit protection is
OUT
desired. Consult the data sheet for more information on
these options.
Figures 1 and 2 show typical demo board efficiency.
The LTC3115-1 data sheet has detailed information about
the operation, specifications, and applications of the part.
The data sheet should be read in conjunction with this
quick start guide.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, µModule, Burst Mode, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
VALUE
2.7V to 40V
5.0V
1A For V
≥ 3.6V,
IN
2A For V
> 6V
IN
See Figures 1 and 2
LTC3115EDHD-1
for applications where
OUT
dc1687af
1
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Related Manuals for Linear Technology DC1687A
Summary of Contents for Linear Technology DC1687A
- Page 1 The demo board has been programmed to operate at 1MHz L, LT, LTC, LTM, µModule, Burst Mode, Linear Technology and the Linear logo are registered in PWM mode to optimize small size with high efficiency trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
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Page 2: Quick Start Procedure
(see data sheet) LOAD = 100mA LOAD = 500mA LOAD = 200mA LOAD = 300mA LOAD = 1A Figure 1. DC1687A Efficiency in PWM Mode Figure 2. DC1687A Efficiency in Burst Mode Operation dc1687af Arrow.com. Arrow.com. Downloaded from Downloaded from... - Page 3 DEMO MANUAL DC1687A Quick start proceDure Figure 3. Proper Measurement Equipment Setup Figure 4. Measuring Input or Output Ripple dc1687af Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from...
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Page 4: Parts List
DEMO MANUAL DC1687A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C1, C2 CAP , CER, 0.10µF , 16V, X7R, ±20%, 0402 TDK, C1005X7R1C104M CAP , CER, 33pF , 50V, C0G, 5%, 0402 TDK, C1005C0G1H330J CAP , CER, 47µF , 10V, 20%, X5R, 1812 TDK, C4532X5R1A476M CAP , CER, 1.0µF , 25V, X5R, 0603... -
Page 5: Schematic Diagram
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. - Page 6 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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